Why is my dog scratching so much? Causes and what to do
Check these signs first
- Typical cost
- $56-$129
- Reading time
- 5 min
- Sources
- 4
- Updated
It's normal for a dog to scratch now and then. But if your dog scratches, licks or chews often, wakes up at night to scratch, or has bald patches, sores or scabs, something really itches. Most of the time the cause is fleas or an allergy, and it can almost always be treated, although finding the cause sometimes takes patience.
The most common causes
- Fleas and flea allergy dermatitis: the number one cause. In allergic dogs, a single bite can cause days of itching, so you may never see a flea.
- Atopic dermatitis: an allergy to things in the environment (dust mites, pollen, molds). It usually starts between 1 and 3 years of age and may get worse in certain seasons.
- Food allergy: to a protein in the diet (such as beef, chicken, dairy or wheat). It causes year-round itching, sometimes with tummy trouble or repeated ear infections.
- Mange: sarcoptic mange causes intense itching and spreads to other dogs and to people. Demodectic mange usually itches less and is more typical in puppies.
- Ear infections: if your dog mostly scratches the ears, shakes the head or the ears smell bad, an ear infection is likely.
- Skin infections from bacteria or yeast (Malassezia), often triggered by another cause of itching.
- Dry skin: from bathing too often, using human shampoo or dry indoor heat.
- Boredom or anxiety: some dogs lick their paws compulsively when left alone or under-stimulated for long hours.
Where your dog scratches: a useful clue
| Itchy area | Usual suspect |
|---|---|
| Lower back, base of the tail and back of the thighs | Fleas and flea allergy |
| Paws (especially between the toes), armpits, groin, face and ears | Atopic dermatitis or food allergy |
| Ear flaps, elbows and ankles, with very intense itching | Sarcoptic mange |
| Ears, with a bad smell, dark wax or head shaking | Ear infection |
This is only a guide: several causes often overlap, and your vet needs to make the diagnosis.
What you can do at home
- Look for fleas: run a fine-tooth comb along the back and the base of the tail over a damp white paper towel. Black specks that turn reddish when wet are flea dirt.
- Make sure flea and tick prevention is up to date and covers what you need. Treat every pet in the home, not just the itchy one. More in how often to deworm a dog. If you find a tick, see how to remove it safely.
- Vacuum thoroughly (couches, carpets, dog beds) and wash bedding in hot water: most fleas (eggs and larvae) live in the home, not on the dog.
- Don't over-bathe, and always use a dog shampoo. Human shampoos upset a dog's skin.
- Don't give antihistamines like Benadryl or use human creams without asking your vet: the dose is different, some don't work in dogs, and some formulas contain ingredients (like decongestants) that are toxic.
- If your dog is making sores, a cone collar or a T-shirt can keep it from getting worse until your appointment.
When to see the vet
Make an appointment if:
- The itching lasts more than one or two weeks or is getting worse.
- There are sores, scabs, bald patches, bumps, red or thickened skin, or a bad smell.
- Your dog scratches the ears or shakes the head a lot.
- People in the home are itchy too: it could be mange.
- Along with skin problems, your dog is gaining or losing weight, seems tired or drinks much more: hormonal conditions such as hypothyroidism or Cushing's disease can also affect the skin.
What the vet will do
Your vet will look at where the lesions are and, depending on what they see, may do a skin scraping (to look for mange mites), cytology (to check for bacteria or yeast) or look in the ears with an otoscope. If they suspect a food allergy, they'll suggest an elimination diet for at least 8 weeks with a new or hydrolyzed protein, with no treats or scraps. A review of veterinary studies found that more than 80% of allergic dogs improve within 5 weeks, but it takes 8 weeks to reach more than 90%. Atopic dermatitis is usually lifelong, but there are treatments that control the itch very well.
A routine exam costs about $56-$129 in the US (Synchrony/CareCredit 2025-2026 cost study); skin tests and medication are extra.
Frequently asked questions
Is it normal for my dog to scratch every day?
A quick scratch after waking up or after a walk is normal. If your dog scratches often throughout the day, keeps licking the paws or gets skin lesions, it isn't normal and it's worth finding the cause.
My dog is scratching but has no fleas. What could it be?
Not seeing fleas doesn't mean there aren't any: in an allergic dog, one bite is enough. If flea prevention is up to date, the most likely causes are an environmental or food allergy, an ear infection or a skin infection.
Can a dog's food allergy be cured?
It can't be cured, but it can be controlled very well. Once an elimination diet identifies the food behind it, avoiding that food makes the itching go away.
Can I give my dog my own antihistamine?
Not without your vet's advice. Some human antihistamines don't work well in dogs, the dose is different, and some products contain other ingredients that can be toxic.
Sources
- Flea Allergy Dermatitis in Dogs (VCA Animal Hospitals)
- Critically appraised topic on adverse food reactions of companion animals (1): duration of elimination diets (Olivry, Mueller and Prélaud, BMC Veterinary Research, 2015)
- CAPC General Guidelines (Companion Animal Parasite Council)
- Veterinary Exam and Procedure Costs (CareCredit)
This article is for general information and does not replace diagnosis or treatment by a veterinarian. If you are worried about your pet's health, call your vet clinic.
